mag·​ne·​to·​sphere | \ mag-ˈnē-tə-ˌsfir How to pronounce magnetosphere (audio) , -ˈne- \

Definition of magnetosphere

: a region of space surrounding a celestial object (such as a planet or star) that is dominated by the object's magnetic field so that charged particles are trapped in it

Keep scrolling for more

Other Words from magnetosphere

magnetospheric \ mag-​ˌnē-​tə-​ˈsfir-​ik How to pronounce magnetospheric (audio) , -​ˈsfer-​ , -​ˌne-​ \ adjective

Examples of magnetosphere in a Sentence

Recent Examples on the Web The axis of Uranus' magnetosphere is also 60 degrees off of its spin axis, creating a significant wobble in its magnetic field. Jennifer Leman, Popular Mechanics, "Uranus, No Joke, Is Leaking Gas," 27 Mar. 2020 Solar, or geomagnetic, storms are disturbances in Earth’s magnetosphere or magnetic field caused by changes in solar wind. Fox News, "Sun's 'boiling' surface revealed in historic high-res images captured by solar telescope," 31 Jan. 2020 In 2012, scientists observed a real-life radiation scrub in progress as the Van Allen Probes circled Earth to explore its radiation belts and magnetosphere. Caroline Delbert, Popular Mechanics, "How Would You Scrub Radiation from Space After a Nuclear Attack?," 27 Dec. 2019 Such a planet would be buffeted by a stronger stellar wind—offering more electrons to be whipped up by the planet's magnetosphere into a signal that could be a million times stronger than Jupiter's. Daniel Clery, Science | AAAS, "This telescope could ‘see’ inside alien worlds for the first time," 9 Oct. 2019 The Earth's magnetosphere is sensitive to deviated solar winds. Daisy Hernandez, Popular Mechanics, "How to See the Northern Lights This Weekend," 30 Aug. 2019 Juno entered the magnetosphere on June 24, 2016, and encountered what is known as a bow shock—a kind of stationary shock wave where the magnetic field begins to drive away solar wind particles. Jay Bennett, Popular Mechanics, "The Juno Spacecraft Reveals New Mysteries at Jupiter," 25 May 2017 High-frequency waves can knock out of the magnetosphere to the ionosphere, which creates the green picket fences. David Grossman, Popular Mechanics, "The Science Behind Earth's Strangest Light Phenomena," 29 Apr. 2019 So scientists analyzed data from satellite footage of STEVE events between April 2008 and May 2016 to measure electric and magnetic fields in the magnetosphere. David Grossman, Popular Mechanics, "The Science Behind Earth's Strangest Light Phenomena," 29 Apr. 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'magnetosphere.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of magnetosphere

1959, in the meaning defined above

History and Etymology for magnetosphere

magneto- + -sphere

Note: Term introduced by the Austrian-born physicist Thomas Gold (1920-2004) in "Motions in the Magnetosphere of the Earth," Journal of Geophysical Research, vol. 64, no. 9 (September, 1959), pp. 1219-24.

Keep scrolling for more

Learn More about magnetosphere

Time Traveler for magnetosphere

Time Traveler

The first known use of magnetosphere was in 1959

See more words from the same year

Statistics for magnetosphere

Last Updated

21 May 2020

Cite this Entry

“Magnetosphere.” Dictionary, Merriam-Webster, Accessed 3 Jun. 2020.

More from Merriam-Webster on magnetosphere

Britannica English: Translation of magnetosphere for Arabic Speakers Encyclopedia article about magnetosphere

Comments on magnetosphere

What made you want to look up magnetosphere? Please tell us where you read or heard it (including the quote, if possible).


See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

May 2020 Words of the Day Quiz

  • a blooming wisteria tree
  • Which is a synonym of exiguous?
Spell It

Can you spell these 10 commonly misspelled words?


Test Your Knowledge - and learn some interesting things along the way.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!